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Description
These craters are found in the highlands of Iceland, and stand out for their somewhat slightly reddish color. It is caused by the oxidation of the ferruginous basalt that makes up the crater. After a volcano stops emitting lava, hot steam escapes from the crater for up to several months. This warm and humid environment is ideal for accelerating oxidation or rusting. This phenomenon can also be found at various other craters.

Description
These craters are found in the highlands of Iceland, and stand out for their somewhat slightly reddish color. It is caused by the oxidation of the ferruginous basalt that makes up the crater. After a volcano stops emitting lava, hot steam escapes from the crater for up to several months. This warm and humid environment is ideal for accelerating oxidation or rusting. This phenomenon can also be found at various other craters.